Improvement in the construction of steam-boilers and tanks



I UNITED-'STATES PATENT OFFIcE.. y

HENRY` JUIIIUs STEIN, .or lieIAivrTI-BAL,`F- MISSOURI.

IMPROVEMENT IN TIIE CONSTRUCTION voT STEAM-contes ANI) TANKS.`

'speciacanonfoming pm of Letters Patent No.' ionefrauatfi octber 4,1870. Y

To all whom it may concern:

Be itknown that I, HENRY J ULIUs STEIN,

of Hannibal, in `the county -of Marion Yand State of Missouri,have invented a new and useful Improvement in` the Construction of SteanrBoilers, Tanks, Src.; andI I do declare that the following is atrue and a c.' ate'description thereof, reference being\had o the accompanying drawings, and` to the lettersot' referencel marked thereon,l`and being apart of this specitication, `in1`whicli Figure' 1 shows a section ot' a boiler-seam shiuiined and partiallycalked on inyiinproved plan, and Fig.2 -is aplan Vof-a shim-piecefor-a band or-ehoop'lap.` I j t s Like letters indicate like parts in each figure. The nature ofmy invention relates to an im- "proved construction ot' steain-boilers,tanks, -&c.; and it consists in the interposition be- I tween the overlappingedgeof the boiler-,sheets ot' astrip of copper or other suitable metal, with an edge. projecting on the facethat isA to becalked. The shim is then punched through -the rivet-holes with a taper punch, the rivets inserted and riveted up. The burr turnedtup I in the shim bythe punch calks them perfectly. VThe projectingedgeofthe shim is then calked up against the edge of the lapping sheet with a square-faced tool,making the seam perfectly tight at a' less lcost than the usual inethodvot chipping and calking the seams, which `is the frequent cause ot' greatfdaniage to such boil- Y ers by cracking the platel'roin thc rivet-holes outward, and weakening the; lower plate by cutting the skin by the chisel in chipping. rIn the drawings,A represents a section of a steam-boiler, between `whose sheets at thelap is interposed axshi'mor strip, B, of copper,

about two inches in width, with an edge projectingoutwardly on the side ,that is vto be calked, as shown at a, Fig. 1, the rivet-holes in the plates being iirst -punched'in the usual manner. When the shim is in place, from the side that the rivet-.heads are made I drive a taperpunch through-the shim` at each rivetn hole, which turns up a burron the shim lining the hole. vI then rivet up the seams, the burr serving to calk the bodyof the rivet under the head.` The burr is shown at b, Fig. 1. When the boiler is riveted up, I calk the projecting edge ot' the'` shim against the seain with a squarefaced tool, as shown at c, Fig. 1, obviating theV expense of chipping the edge of the overlapping plate, which, it is well known, is

Vliabletocrack the plates at the rivet-holes in hard calking; also the weakening of the under plate by cutting it with the corner ofthe chisel. tight, will not be corroded from leakage, and is not att'ected by the expansion and contraction of theplates, nor will the rivets leak under the heads.

Fig.2 shows a plan ot' a shim designed for a cylinder-boiler built up ot alternate large and small hoops, the former overlapping the latter. The shini is composed of two parallel strips, d, extending around the boiler, and designeil to have the ends abut at the top ot' the sheet, with a bridge-piece, e, wherever-needed to shim va longitudinal seam, which bridgeA pieces may be brazed tothe others.

'Preferably I calk the seams from the inside ot' the boiler, when practicable, in which casel and other vessels, the shiins B, when interposed between theoverlapping seams thereof and calked, as set forth, t'or the purpose specified.

HENRY `JULIUs STEIN.

Witnesses:

I ETER WAcHENpoRFER, LUDWIG DTscHER.

Aseain so calked will remain perfectly I 

